public static Task <SagaStorageFile> Open(Guid sagaId, SagaManifest manifest, CancellationToken cancellationToken = default)
{
var filePath = manifest.GetFilePath(sagaId);
if (!File.Exists(filePath))
{
return(noSagaFoundResult);
}
return(OpenWithRetryOnConcurrency(filePath, FileMode.Open, cancellationToken));
}
public static Task <SagaStorageFile> Open(Guid sagaId, SagaManifest manifest)
{
var filePath = manifest.GetFilePath(sagaId);
if (!File.Exists(filePath))
{
return(noSagaFoundResult);
}
return(OpenWithDelayOnConcurrency(filePath, FileMode.Open));
}
SagaStorageFile(FileStream fileStream, SagaManifest manifest)
{
this.fileStream = fileStream;
this.manifest = manifest;
jsonWriter = new JsonTextWriter(new StreamWriter(fileStream, Encoding.Unicode))
{
CloseOutput = true,
Formatting = Formatting.Indented
};
jsonReader = new JsonTextReader(new StreamReader(fileStream, Encoding.Unicode))
{
CloseInput = true
};
}
static async Task <SagaStorageFile> OpenWithDelayOnConcurrency(SagaManifest manifest, string filePath, FileMode fileAccess)
{
try
{
return(new SagaStorageFile(new FileStream(filePath, fileAccess, FileAccess.ReadWrite, FileShare.None, DefaultBufferSize, FileOptions.Asynchronous), manifest));
}
catch (IOException)
{
// give the other task some time to complete the saga to avoid retrying to much
await Task.Delay(100)
.ConfigureAwait(false);
throw;
}
}
public SagaManifestCollection(SagaMetadataCollection sagas, string storageLocation)
{
foreach (var metadata in sagas)
{
var sagaStorageDir = Path.Combine(storageLocation, metadata.SagaType.FullName.Replace("+", ""));
if (!Directory.Exists(sagaStorageDir))
{
Directory.CreateDirectory(sagaStorageDir);
}
var manifest = new SagaManifest
{
StorageDirectory = sagaStorageDir,
SagaEntityType = metadata.SagaEntityType
};
sagaManifests[metadata.SagaEntityType] = manifest;
}
}
public SagaManifestCollection(SagaMetadataCollection sagas, string storageLocation, Func <string, string> sagaNameConverter)
{
foreach (var metadata in sagas)
{
var sagaStorageDir = Path.Combine(storageLocation, sagaNameConverter(metadata.SagaType.FullName));
if (!Directory.Exists(sagaStorageDir))
{
Directory.CreateDirectory(sagaStorageDir);
}
var manifest = new SagaManifest
{
StorageDirectory = sagaStorageDir,
SagaEntityType = metadata.SagaEntityType
};
sagaManifests[metadata.SagaEntityType] = manifest;
}
}
public static Task <SagaStorageFile> Create(Guid sagaId, SagaManifest manifest)
{
var filePath = manifest.GetFilePath(sagaId);
return(OpenWithDelayOnConcurrency(filePath, FileMode.CreateNew));
}
public static Task <SagaStorageFile> Create(Guid sagaId, SagaManifest manifest, CancellationToken cancellationToken = default)
{
var filePath = manifest.GetFilePath(sagaId);
return(OpenWithRetryOnConcurrency(filePath, FileMode.CreateNew, cancellationToken));
}